<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #grid {
      direction: rtl;
      display: grid;
      grid:
        "header header header" 30px
        "left   main   main"   50px
        "footer footer footer" 30px /
         2fr    4fr    4fr;
      background-color: antiquewhite;
    }

    .main {
      grid-area: main;
      justify-self: start;
    }
  </style>
</head>
<body>
  <div id="grid">
    <div class="main">this is main son</div>
  </div>
</body>
</html>